Good foods that go good with mashed potatoes are.
Bread, Chicken, Catfish, Beef Wellington, Steak, Meatloaf, Meatballs, Chicken Gordon Bleu.
Other foods that go well with mashed potatoes are potato croquettes, Salisbury Steak, Fried Chicken and Gravy, Steak and pan sauce.
Roast Chicken.
Potato Pierogi.
Fish Pie.
Grilled steaks
Sausages (grilled or boiled)
Ground lamb (as part of a Shepherd’s Pie)
Chicken in some sort of sauce (Chicken a la King, Chicken Francese, etc.)
Stews of any kind of meat (beef, pork, chicken, etc.)
Fish filets (usually in a Beurre Blanc sauce)
You can also top the mashed potatoes with some gravy and hamburger.
Or even top the mashed potatoes and gravy with some nacho cheese.
You could also dip nacho chips into the nacho cheese and gravy mashed potatoes.